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Modelling and feedback control of vortex shedding for drag reduction of a turbulent bluff body wake

机译:涡流脱落的建模和反馈控制,用于减少湍流钝体尾流的阻力

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Three-dimensional bluff body wakes are of key importance due to their relevance to the automotive industry. Such wakes have both large pressure drag and a number of coherent flow structures associated with them. Depending on the geometry, these structures may include both a bistability resulting from a spatial symmetry breaking (SB), and a quasi-periodic vortex shedding. The authors have recently shown that the bistability may be modelled by a Langevin equation and that this model enables the design of a feedback control strategy that efficiently reduces the drag through suppression of asymmetry. In this work the stochastic modelling approach is extended to the vortex shedding, capturing qualitatively both the forced and unforced behaviour. A control strategy is then presented that makes use of the frequency response of the wake, and aims to reduce the measured fluctuations associated with the vortex shedding. The strategy proves to be effective at suppressing fluctuations within specific frequency ranges but, due to amplification of disturbances at other frequencies, is unable to give drag reduction.
机译:三维虚张声势的车身尾流由于与汽车工业相关,因此至关重要。这样的尾流既具有大的压力阻力,又具有许多与其相关的相干流动结构。取决于几何形状,这些结构可以既包括由于空间对称性破坏(SB)导致的双稳态性,又包括准周期性涡旋脱落。作者最近表明,双稳态可以通过Langevin方程建模,并且该模型可以设计一种反馈控制策略,该策略有效地降低了通过抑制不对称性而产生的阻力。在这项工作中,随机建模方法扩展到涡旋脱落,定性地捕获了强迫行为和非强迫行为。然后提出了一种控制策略,该策略利用了尾流的频率响应,旨在减少与涡旋脱落相关的测量波动。该策略被证明可以有效地抑制特定频率范围内的波动,但是由于放大了其他频率上的干扰,因此无法降低阻力。

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